A noise reduction case for a suspended fan

Abstract

The utility model belongs to the technical field of noise reduction device, and relates to a noise reduction machine case for suspension fan, to solve the problem of big noise of existing fan machine case, including machine case, fan and frequency converter, the host cavity in the machine case of fan installation, the one side of machine case is provided with frequency converter cavity, the other side of machine case sets up air inlet air duct, still including auxiliary air inlet air duct, auxiliary air duct noise reduction device, host cavity noise reduction device, sound insulation cavity, sound insulation cavity noise reduction device, sound insulation cavity sets up in host cavity bottom, auxiliary air inlet air duct sets up between frequency converter cavity and host cavity, auxiliary air inlet air duct is linked with frequency converter cavity and sound insulation cavity, and sound insulation cavity is linked with host cavity and air inlet air duct, auxiliary air duct noise reduction device sets up in auxiliary air inlet air duct, host cavity noise reduction device sets up in host cavity, and sound insulation cavity noise reduction device sets up in sound insulation cavity. The above-mentioned noise reduction machine case improves the absorption conversion effect to noise, and reduces the noise when working.

Description

Technical Field

[0001] This utility model belongs to the field of noise reduction device technology, and in particular relates to a noise reduction housing for a suspended fan. Background Technology

[0002] A suspended blower is a centrifugal blower that utilizes magnetic levitation or air suspension bearing technology to achieve contactless, oil-free, and highly efficient operation, making it suitable for energy-saving, consumption-reducing, and clean process scenarios.

[0003] Suspended fans generate significant noise during operation, necessitating noise reduction measures. However, existing suspended fans lack corresponding noise reduction designs or have incomplete sound insulation, failing to effectively reduce noise levels. Furthermore, the lack of coordination between the airflow and acoustic paths in existing fans leads to uncontrolled low- and mid-frequency noise, with the cooling airflow becoming a noise leakage channel. Therefore, a noise reduction structure suitable for suspended fan enclosures needs to be designed. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a noise-reducing enclosure for a suspended fan.

[0005] This utility model provides a noise reduction chassis for a suspended fan, including a chassis, a fan and a frequency converter. The fan is installed in the main unit cavity of the chassis, the frequency converter is installed in the frequency converter cavity on one side of the chassis, and an air intake duct is provided on the other side of the chassis. It also includes an auxiliary air intake duct, an auxiliary air duct noise reduction device, a main unit cavity noise reduction device, a sound insulation cavity, and a sound insulation cavity noise reduction device. The sound insulation cavity is disposed at the bottom of the main unit cavity, the auxiliary air intake duct is disposed between the inverter cavity and the main unit cavity, the auxiliary air intake duct is connected to the inverter cavity and the sound insulation cavity, and the sound insulation cavity is connected to the main unit cavity and the air intake duct; The auxiliary air duct noise reduction device is installed inside the auxiliary air intake duct, the main unit cavity noise reduction device is installed inside the main unit cavity, and the sound insulation cavity noise reduction device is installed inside the sound insulation cavity.

[0006] The noise-reducing enclosure for the suspended fan of this utility model has the following advantages compared with the prior art: The suspended fan in this application features a noise-reducing enclosure with an auxiliary air intake duct and an auxiliary duct noise reduction device. Together with the intake duct, this design effectively reduces the noise generated during fan operation while ensuring sufficient airflow. The main unit cavity, sound insulation cavity, auxiliary air intake duct, and intake duct itself have a multi-bend structure, further enhancing the noise reduction effect. Combined with the noise reduction devices in the main unit cavity and sound insulation cavity, the noise generated during fan operation is minimized to the greatest extent possible. Attached Figure Description

[0007] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the noise reduction casing for the suspended fan in an embodiment of this utility model; Figure 2 yes Figure 1 Cross-sectional view of the noise-reducing enclosure for a medium-suspension fan; Figure 3 This is a structural diagram of the existing suspended fan casing.

[0008] 10-Chassis, 11-Main unit cavity noise reduction device, 20-Fan, 30-Inverter cavity, 31-Inverter cavity noise reduction device, 40-Auxiliary air intake duct, 41-Auxiliary air duct noise reduction device, 50-Sound insulation cavity, 51-Sound insulation cavity noise reduction device. Detailed Implementation

[0009] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0010] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0011] like Figures 1 to 3 As shown, the noise reduction chassis for the suspended fan provided by this utility model includes a chassis 10, a fan 20 and a frequency converter. The fan 20 is installed in the main unit cavity of the chassis 10, the frequency converter is installed in the frequency converter cavity 30 on one side of the chassis 10, and an air intake duct is provided on the other side of the chassis 10. It also includes an auxiliary air intake duct 40, an auxiliary air duct noise reduction device 41, a main unit cavity noise reduction device 11, a sound insulation cavity 50 and a sound insulation cavity noise reduction device 51. The sound insulation cavity 50 is located at the bottom of the main unit cavity, and the auxiliary air intake duct 40 is located between the inverter cavity 30 and the main unit cavity. The auxiliary air intake duct 40 is connected to the inverter cavity 30 and the sound insulation cavity 50, and the sound insulation cavity 50 is connected to the main unit cavity and the air intake duct. The auxiliary air duct noise reduction device 41 is installed in the auxiliary air intake duct 40, the main unit cavity noise reduction device 11 is installed in the main unit cavity, and the sound insulation cavity noise reduction device 51 is installed in the sound insulation cavity 50.

[0012] like Figure 2 As shown in the figure, the dashed arrows represent the direction of air travel, and the solid arrows represent the path of sound propagation. The designed auxiliary air intake duct 40 and sound insulation cavity 50 extend the propagation distance of the air. The auxiliary air duct noise reduction device 41 and the sound insulation cavity noise reduction device 51 improve the absorption and conversion of noise, thereby reducing noise.

[0013] The suspended fan in this application features a noise-reducing enclosure with an auxiliary air intake duct and an auxiliary duct noise reduction device. Together with the intake duct, this design effectively reduces the noise generated during fan operation while ensuring sufficient airflow. The main unit cavity, sound insulation cavity, auxiliary air intake duct, and intake duct itself have a multi-bend structure, further enhancing the noise reduction effect. Combined with the noise reduction devices in the main unit cavity and sound insulation cavity, the noise generated during fan operation is minimized to the greatest extent possible.

[0014] This product's structural design and function are intended to guide the noise from the suspended fan into a pre-designed soundproof cavity. By using a curved path, it extends the sound wave propagation distance, reducing noise energy. The air drawn into the casing also flows along a designed path, undergoing progressive attenuation through multiple soundproofing layers, significantly reducing noise energy. The internal noise reduction materials consist of EPDM rubber-based damping layer soundproofing felt and polyester fiber-backed fireproof sound-absorbing cotton, ensuring uniform coverage and significantly improving the overall noise reduction effect. The synergistic effect of the soundproofing felt and sound-absorbing cotton forms a multi-layered sound barrier, effectively blocking the noise propagation path and reducing sound wave reflection intensity.

[0015] 1. Directional Sound Wave Guidance and Path Dissipation: The unique structural design actively guides the noise generated by the fan into a pre-designed soundproof cavity with a specific geometry (such as bending or deflection). This cavity structure significantly extends the sound wave propagation path, and during this process, sound wave energy is continuously dissipated through air friction, boundary layer effects, and multiple reflections (path dissipation effect), thereby achieving a significant initial reduction in noise energy. Compared to traditional straight-through or simple enclosed soundproofing designs, this solution is particularly effective in suppressing mid-to-low frequency noise.

[0016] 2. Synergistic Optimization of Airflow and Acoustic Paths: The airflow drawn into the chassis and the cooling air from the inverter also pass through the sound insulation cavity, harmonizing it with the sound wave attenuation path within the cavity. As the airflow passes through multiple sound insulation layers, the noise energy it carries is absorbed and attenuated step-by-step and efficiently (step-by-step attenuation effect). This integrated design of airflow and acoustic paths avoids secondary noise caused by airflow short-circuiting or eddies, ensuring the stability and comprehensiveness of the noise reduction effect.

[0017] 3. Synergistic Barrier Effect of Multi-Layer Composite Sound Insulation Materials: EPDM Rubber-Based Damping Layer Sound Insulation Felt: Primarily targets mid-to-high frequency noise, it possesses excellent damping loss factors, effectively absorbing and converting noise generated by structural vibrations and blocking solid-borne sound transmission paths. Its flexibility and high density allow it to tightly adhere to complex structural surfaces, significantly suppressing radiated noise caused by vibration (vibration suppression and mid-to-high frequency absorption). Polyester Fiber-Applied Fire-Resistant Sound-Absorbing Cotton: Primarily targets mid-to-low frequency noise, it has porous sound-absorbing properties, converting sound energy into heat energy through inter-fiber friction. Its attached fire-resistant layer enhances the material's flame-retardant safety and structural strength, while optimizing surface acoustic properties and reducing sound wave reflection (porous sound absorption and low-frequency dissipation). Synergistic Effect: The two materials form a multi-layered sound barrier within the structure, with complementary physical and acoustic properties. Sound insulation felt focuses on suppressing vibration and blocking the propagation path, while sound-absorbing cotton focuses on absorbing and dissipating sound energy. The combination of the two covers a wider range of noise spectrum (wideband noise reduction), effectively blocking the core path of noise propagation and significantly reducing the intensity of sound wave reflection in the cavity (reducing reverberation).

[0018] 4. The Multiplier Effect of Scientific Layout and Uniform Coverage: Through precise acoustic simulation and layout design, the sound insulation materials (sound insulation felt and sound-absorbing cotton) are ensured to achieve uniform and seamless coverage at key sound wave reflection points (such as cavity walls and turning points) and throughout the entire airflow / sound wave channel. This targeted layout maximizes the noise reduction potential of the materials, forming a "key defense" in areas where sound energy gathers, significantly improving the overall noise reduction efficiency of the structure (multiplier effect).

[0019] 5. Overall Results: The combined effect of the aforementioned structural design, path optimization, and material synergy ultimately results in a significant and quantifiable reduction in the overall noise level of the suspended fan 20 during operation. Compared to traditional structures, it reduces noise by less than 80 dB under the same power output of the enclosure 10, greatly improving the user experience and environmental friendliness. Simultaneously, this design, while ensuring excellent noise reduction performance, also considers aerodynamic efficiency, fire safety, and structural reliability.

[0020] As one possible implementation, the noise reduction chassis 10 also includes a frequency converter cavity noise reduction device 31; the frequency converter cavity noise reduction device 31 is disposed on the top of the frequency converter cavity 30.

[0021] The inverter cavity noise reduction device 31 is an auxiliary air intake duct noise reduction device 41 for the auxiliary air intake duct 40, which effectively avoids the propagation of noise after passing through the auxiliary air intake duct 40.

[0022] As one possible implementation, the noise reduction device 11 of the main unit cavity includes a damping sound insulation felt layer and a polyester fiber sound absorption cotton layer; the damping sound insulation felt layer and the polyester fiber sound absorption cotton layer are evenly laid in the main unit cavity, and the damping sound insulation felt layer and the polyester fiber sound absorption cotton layer are laid in a multi-layer form.

[0023] The damping sound insulation felt layer and the polyester fiber sound-absorbing cotton layer can effectively absorb and convert mid-to-high frequency noise and mid-to-low frequency noise. Combined with the multi-layer laying method, it can reduce the propagation of noise to the greatest extent.

[0024] As one possible implementation, the air inlet of the main unit cavity is located on the side close to the auxiliary air intake duct 40, and the main unit cavity is connected to the sound insulation cavity 50 through the air inlet.

[0025] By placing the air inlet of the main unit cavity near the auxiliary air intake duct 40, the noise propagation distance is extended. Combined with various noise reduction devices, this improves the absorption and conversion of noise, thus reducing noise propagation.

[0026] As one possible implementation method, noise reduction devices are provided in both the air intake duct and the air inlet of the inverter cavity 30.

[0027] This effectively prevents noise from escaping from inside the chassis 10.

[0028] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0029] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A noise-reducing enclosure for a suspended fan, comprising an enclosure, a fan, and a frequency converter, wherein the fan is installed within the main unit cavity of the enclosure, a frequency converter cavity is provided on one side of the enclosure, and an air intake duct is provided on the other side of the enclosure, characterized in that, It also includes auxiliary air intake duct, auxiliary air duct noise reduction device, main unit cavity noise reduction device, sound insulation cavity, and sound insulation cavity noise reduction device; The sound insulation cavity is disposed at the bottom of the main unit cavity, the auxiliary air intake duct is disposed between the inverter cavity and the main unit cavity, the auxiliary air intake duct is connected to the inverter cavity and the sound insulation cavity, and the sound insulation cavity is connected to the main unit cavity and the air intake duct; The auxiliary air duct noise reduction device is installed inside the auxiliary air intake duct, the main unit cavity noise reduction device is installed inside the main unit cavity, and the sound insulation cavity noise reduction device is installed inside the sound insulation cavity.

2. The noise-reducing enclosure for a suspended fan according to claim 1, characterized in that, The noise reduction chassis also includes a frequency converter cavity noise reduction device; The inverter cavity noise reduction device is located at the top of the inverter cavity.

3. The noise-reducing enclosure for a suspended fan according to claim 1, characterized in that, The noise reduction device for the main unit cavity includes a damping sound insulation felt layer and a polyester fiber sound-absorbing cotton layer; The damping sound insulation felt layer and the polyester fiber sound-absorbing cotton layer are evenly laid inside the main unit cavity, and the damping sound insulation felt layer and the polyester fiber sound-absorbing cotton layer are laid in a multi-layer form.

4. The noise-reducing enclosure for a suspended fan according to claim 1, characterized in that, The air inlet of the main unit cavity is located on the side close to the auxiliary air intake duct, and the main unit cavity is connected to the sound insulation cavity through the air inlet.

5. The noise-reducing enclosure for a suspended fan according to claim 1, characterized in that, Noise reduction devices are installed in both the air intake duct and the air inlet of the inverter cavity.

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